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#include "byte.h"
#include "buffer.h"
#include "scan.h"
int buffer_get_token_pred(buffer* b,char* x,unsigned int len,string_predicate p) {
int blen;
for (blen=0;blen<len;++blen) {
register int r;
if ((r=buffer_getc(b,x))<0) return r;
if (r==0) break;
if (p(x-blen,blen+1)) break;
return blen;